Caption: Giganotosaurus carolinii head. Palaeontologist Rodolfo Coria (right) and assistant work on a reconstruction of the head of the largest carnivorous dinosaur discovered to date. The fossil bones are below the white frame. Bigger even than Tyrannosaurus rex, Giganotosaurus may have been the largest meat-eater to walk the Earth. Its 110-million-year-old bones were found in 1993 at El Chocon, Argentina, by Coria and colleagues. Among the fragments were a jawbone and thigh bone, both longer than matching bones in the biggest T. rex. The new species is thought to be part of the same general lineage as Tyrannosaurus. Photographed in 1995.